Top-rack-only failure points to loading, a blocked upper spray arm, a disconnected rack water feed or insufficient circulation to that level. Spin the upper arm by hand and check its holes for food and mineral scale. Slide the rack out and back until it is fully seated and check that the connector is intact.
What this covers
- Dishwashers · spray system
What it does not cover
Differential
Likely causes of “Dishwasher top rack is not getting clean”, and how to tell them apart
- 1
The upper spray arm is blocked or does not turn
What separates it Only the top rack has dirty items and the arm spins with effort or not at all.
How to confirm Spin the upper arm by hand and check its holes for food and mineral scale.
- 2
The rack is not fully docked into its water feed
What separates it The adjustable rack sits crooked and the water connection at the rear or side is not seated.
How to confirm Slide the rack out and back until it is fully seated and check that the connector is intact.
- 3
Tall items are shielding the spray
What separates it Cookware on the lower rack or a tall top-rack piece blocks the spray path.
How to confirm Reload so that items do not block the arm.
- 4
Circulation is too weak to reach the top level
What separates it The lower rack is weak too and the pump sounds strained.
How to confirm Run an empty cycle and listen to the spray on the tub walls.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which items on the upper rack are dirty and whether they are always the same.
- Whether the top arm turns freely by hand.
- Whether the rack is adjustable and whether it is fully docked.
Try in this order
0 of 4 completedObserve before changing anything
ReversibleConfirm the upper arm turns freely and inspect where the rack docks into the rear or side water port.
Isolate the failing boundary
ReversibleRun empty after clearing approved spray holes and fully seating the adjustable rack.
Apply the narrow correction
ReversibleReload tall items away from spray paths and use the cycle recommended for the soil level.
Verify the result and stop at the boundary
ReversibleService is appropriate if the upper feed receives no water while lower wash action is strong.
Stop boundary
When this stops being a self-service repair
- !Service is appropriate if the upper feed gets no water while the lower wash action is strong.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why is only the top rack dirty?+
The upper arm and its feed connection are separate from the lower arm, so a blocked arm or a rack that is not docked affects only that level.
Could loading be the cause?+
Yes. A tall pot or a tray blocking the arm's sweep leaves the upper rack dry. Spin the arm by hand before each cycle to check it.
How do I check the arm?+
Spin it and check nozzles.
Can loading matter?+
Yes. Tall items may block spray.